
Converting a disk image
You can use Disk Utility to convert the image format and encryption of a disk image.
For example, if you create a "read/write" disk image but later want to protect the image from changes, you can convert the image to "read only" format.
- If the disk image is open, select it in the list of disks and volumes.
- Choose Images > Convert.
If you haven't selected the disk image, locate it in the dialog and click Convert.
- Choose the new image format or encryption.
- Type a new name for the image, and click Save.
You can also change the volume format of a disk image using the Erase panel. When you create a disk image, its format is Mac OS Extended (Journaled). When you erase a disk image, you can change it to another format, such as UNIX File System. Erasing a disk image deletes all the files it contains.